Remove isolated app code from iOS's chrome_browser_state_io_data.

ios/chrome/browser/browser_state/chrome_browser_state_io_data.h

Index: ios/chrome/browser/browser_state/chrome_browser_state_io_data.h
diff --git a/ios/chrome/browser/browser_state/chrome_browser_state_io_data.h b/ios/chrome/browser/browser_state/chrome_browser_state_io_data.h
index 837cf9b843c3cf6121c30ff1f054a0c62618f501..5f6ab62eb3f6942329bf522e0954b9ee864e4722 100644
--- a/ios/chrome/browser/browser_state/chrome_browser_state_io_data.h
+++ b/ios/chrome/browser/browser_state/chrome_browser_state_io_data.h
@@ -91,9 +91,6 @@ class ChromeBrowserStateIOData {
   void Init(ProtocolHandlerMap* protocol_handlers) const;
 
   net::URLRequestContext* GetMainRequestContext() const;
-  net::URLRequestContext* GetIsolatedAppRequestContext(
-      net::URLRequestContext* main_context,
-      const base::FilePath& partition_path) const;
 
   // These are useful when the Chrome layer is called from the content layer
   // with a content::ResourceContext, and they want access to Chrome data for
@@ -136,25 +133,6 @@ class ChromeBrowserStateIOData {
   }
 
  protected:
-  // A URLRequestContext for apps that owns its cookie store and HTTP factory,
-  // to ensure they are deleted.
-  class AppRequestContext : public net::URLRequestContext {
-   public:
-    AppRequestContext();
-
-    void SetCookieStore(net::CookieStore* cookie_store);
-    void SetHttpTransactionFactory(
-        scoped_ptr<net::HttpTransactionFactory> http_factory);
-    void SetJobFactory(scoped_ptr<net::URLRequestJobFactory> job_factory);
-
-   private:
-    ~AppRequestContext() override;
-
-    scoped_refptr<net::CookieStore> cookie_store_;
-    scoped_ptr<net::HttpTransactionFactory> http_factory_;
-    scoped_ptr<net::URLRequestJobFactory> job_factory_;
-  };
-
   // Created on the UI thread, read on the IO thread during
   // ChromeBrowserStateIOData lazy initialization.
   struct ProfileParams {
@@ -249,16 +227,6 @@ class ChromeBrowserStateIOData {
       ProfileParams* profile_params,
       ProtocolHandlerMap* protocol_handlers) const = 0;
 
-  // Does an on-demand initialization of a RequestContext for the given
-  // isolated app.
-  virtual net::URLRequestContext* InitializeAppRequestContext(
-      net::URLRequestContext* main_context) const = 0;
-
-  // These functions are used to transfer ownership of the lazily initialized
-  // context from ChromeBrowserStateIOData to the URLRequestContextGetter.
-  virtual net::URLRequestContext* AcquireIsolatedAppRequestContext(
-      net::URLRequestContext* main_context) const = 0;
-
   // The order *DOES* matter for the majority of these member variables, so
   // don't move them around unless you know what you're doing!
   // General rules:
@@ -307,8 +275,6 @@ class ChromeBrowserStateIOData {
   // These are only valid in between LazyInitialize() and their accessor being
   // called.
   mutable scoped_ptr<net::URLRequestContext> main_request_context_;
-  // One URLRequestContext per isolated app for main and media requests.
-  mutable URLRequestContextMap app_request_context_map_;
 
   mutable scoped_refptr<content_settings::CookieSettings> cookie_settings_;